Resinous depilatory composition



. further solvent to Patented Oct. 14,1941

S PATENT OFF-ICE.

aasmous narma'ronr comrosrrlo Thomas Norman Weiskirch, Le May, Mm, as-

signor to Inter-Coastal Paint Corporation, East St. Louis, IlL, acorporation of-Illinois No Drawing.

Application June 24, 1941,

Serial N0. $99,527

sclaims.

This invention relates to a-new type of depilatory composition and more particularly to a depilatory composition especially adapted for the removal of hair from edible carcasses such as hogs, chickens and the like.

To clean edible carcasses it has been customary to dip them in hot water and remove dermal excrescences by pulling or scraping them from the skin of the carcass Later it was found that molten pitch or rosin could be embedded in the hair or feathers, cooled and stripped from the carcass, bringing the hair or feathers with it.

' Such compositions have been improved somewhat in the past decades but have been far from satisfactory because they were too high melting and I scorched the carcass, or stained the carcass ordecomposed with use or had other defects. Obviously, scorching or staining of an edible carcass destroys or reduces its salability to a marked extent. I r

It is the object of my invention to provide a stable low-melting depilatory composition which tenaciously grips dermal excrescences, such as hair and pin feathers, when the composition is deposited thereon and-allowed to cool, and which will not scorch or stain edible carcasses.

These objects are accomplished by my invention which in its broader aspects comprises a I composition consisting essentially of a major proportion of rosin and a'minor proportion of petroleum resin of the type known as "Duosol" and resulting from the solvent extraction of certain petroleum residuum including the lubricating oil fraction. More specifically, my invention com-- prises a composition consisting essentially of 60 to. 90 parts-of rosin and 40 to 10 parts of petro-' leum resin.

!'or some time it has been known that in crude petroleum there isa resin fraction lying between the asphalt fraction and the lubricating oil fraction thereof. This resin fraction is termed petrois distilled ofl from the crude, the lubricating oil leum resin and when the lubricating oil fraction. I

normally has these, petroleum resins dissolved I therein. It has been found that these petroleum resins can readily be removed lay-subjecting the I crude residuum v(after distilling on gasoline, kerosene and light oils) to extraction with such solvents as propane, nitrobenzene, phenol, cresylicproper temperature. The asphalt remains as an undissolved residuum whereas-the petroleum resins and lubricating oil are dissolved and dec ted off. By then adding the deasphalted extract, the (free from asphalt) are preacid, or furfural at the petroleum" resins Y combinations and variations of this technique and the properties of these petroleum resins so produced are more fully described at pages 294 to 298 of the March, 1940, Industrial & Engineering Chemistry and other publications therein mentioned. The preferred petroleum resin which I may employ in my new depilatory composition -may be produced by substituting cresylic acid as the extractant, for nitrobenzene in the left hand side of Fig. 3 at page 296 of the foregoing publication, although any of these petroleum resins are suitable. As is well known in the art, the viscosity and softening characteristics of these petroleum resins may be varied considerably by fractional precipitation, fractional vacuum distillation, temperature manipulation during extraction and precipitation, and manipulation of the cresylic acid to propane ratio in the last stages of the resin producing of the process for producing these Petroleum resins makes them substantially. free from asphalt.

In my co-pending application Serial No. 335,135, filed May 14, 1940, of which this is a continuation in part, I'have described a depilatory composition having two essential constituents-a major pro ortion of ordinary turpentine rosin or wood rosin, and a minor proportion of petroleum resin (but not substantially less than 10% of petroleum resin), the petroleum resin having a.

bolt Furol viscosity at 210* F. of 115 seconds.

That is a good general purpose depilatory compo- I sition. r

I have now found that a petroleum resin. of somewhat broader viscosity and pour point may be employed in my depilatory composition with the result that more widely varied properties of workability and gripping power may be obtained for the depilatory composition. Thus' I have found that I may employ in the same proportions f with increased utility, a petroleum resin having a Saybolt Furol viscosity of 35 seconds to 210 seconds, measured at 210 F., and having a pour point of from 50 F. to 100 F. "For a hard quickcongealing depilatory composition I employ a petroleum resin having a Saybolt Furol viscosity at 210 F. of about 125 to 210 seconds and a pour 'point of about to F. For a soft slow-congealing depilatory composition I employ a petroleum resin having a Saybolt Furolviscosity at' 210 F. of about 35; to seconds and a pour point of about 50,to 65 F.

My composition is prepared simply by adding process. The very nature the rosin and the resin, m theproper proportions,

' to a jacketed mixer which is heated with steam,

hot water, or hot oil until the materials are molten, whereupon they are mixed thoroughly until entirely homogeneous. By bringing the components to a temperature of 200 to 350 F. they generally become sufficiently molten for proper mixing although if necessary they may be brought to a higher temperature if not held at that higher temperature for an unreasonable length of time. After thorough mixing, the composition is ready for use and may be poured 01$ temperature of 225 to 325 F.-and is quite molten. This molten composition is then sprayed or brushed upon the carcass or the carcass may be dipped therein and allowed to drain. The composition hardens readily at normal atmospheric. temperatures and may then be stripped from the carcass, bringing all dermal excrescences such as hair (from hogs) or pin feathers (from fowl) .with the fragments of hardened depilatory composition. The carcass is then clean, unscorched, unstained and in highly salable condition. No chilling of my composition is necesinto large heated .vats for immediate use or may be poured into barrels for storage 'or shipment.

As above pointed out, my depilatory composition has two essential constituents-a major proportion of ordinary turpentine rosin or wood rosin and a minor proportion of petroleum resin (but not substantially less than 10% of petroleum resin). In its preferred embodiment my composition'contains from 60 to 90 parts of rosin and from 40 to 10 parts of petroleum resin. The proportion of petroleum resin employed depends upon the hardness or softness desired for the iinal depilatory composition. The petroleum resin acts to toughen and plasticize the rosin. Therefore,

ifa somewhat hard composition is desired, I may i employ 90 parts rosin andonly -10 parts of the higher viscosity petroleum resin. On the other hand if a tough, lower melting, more plasticized composition is desired, I may employ 60 parts rosin and 40 parts of the lower viscosity petroleum resin. Other ingredients may be added in small amounts to my composition so long as they do not detract from the useful properties thereof.

' For instance, certain synthetic thermoplastic resins may be added but care must be taken not to detract from stability or not to increase viscosity or melting point of the depilatory composition too materially or not to cause staining.

My composition has a number of unusual advantages. When applied molten to an edible carcass it has the property of gripping hair or pin feathers very tenaciously so that when the composition is hardened, broken and. pulled from the carcass, it very efiectlvely pulls all dermal excrescences fromthe carcass, leaving. it clean. The natural tackiness of the petroleum resin gives to my depilatory composition unusually strong depilatory action. My composition may be used repeatedly and melted many times or kept molten for long periods of time without decomposing, because of the 'unoxidizable nature 01' the petroleum resin. Because it melts at a low temperature, my composition does not scorch the most delicate carcass or hide; its low viscosity permits easy spraying at lower temperatures. Because neither the rosin nor the petroleum resin stain or decompose into staining ingredients, my

composition does not stain the carcass upon which make it an ideal depilatory composition.

. without being required to be chilled. After use,

without extreme chilling and lack effective depilatory action. Compositions of rosin and asphalt are disqualified because they stain the carcass badly, deteriorate with use and lack eilective depilatory action.

Contrasted to these, my depilatory composition is stable, is easily prepared and applied, is not expensive and has effective depilatory action it may be reused many times by merely heating and filtering out the dermal excrescences em- I bedded therein.

Herein, where I refer to rosin that term is, of course, intended to include all of the various forms of turpentine or wood rosins of commerce whether they be the purified grades or the cheaper impure grades and whether they be light or dark. Among the grades of rosin which may be used are those known as B Rosin or Benny 45,Rosin as well as that bearing the trade name of it is used. There are many other advantages,

onds to 210 seconds. which, all together,

' y composition is easy to employ. If a poultry carcass is to be cleaned, the large ,i'ea'thers are plucked in the'usual manner. If a hog carcass is to be cleaned it is first cleaned and scraped to remove dirt and some of the hair. My composition in the meantime, has been brought to a 105 seconds.

I NORMAN WEISKIRCH.

Belro."

What I claim is: 1. A depilatory composition comprising a major proportion of rosin and a minor proportion (but not less than 10%) of a petroleum resin which is substantially free from asphalt and which has a pour point of 50 F. to 100 F. and a Saybolt Furol viscosity at 2l0 F. of 35 seconds to 2 0 seconds. i l

2. A depilatory composition comprising a major proportion of rosin and .a minor proportion (but not less than 10%) of a petroleum resin which is substantially free from asphalt and which has a pour point of about F. to F. and a Baybolt Furol viscosity of 210 F.. of about sec- 3. A depilatory composition comprising a major proportion of rosin and a minor proportion (but not less than 10%) of a petroleum resin which is substantially free from asphalt and which has-a pour point of 50 F. to about 65 F. and a Saybolt Furol viscosity at 210 F. of 35 seconds to about Rosin alone, is entirely too brittle and lacks 

